ENH more pythonic way to treat list of list of labels
ENH add multilabel accuracy based on jaccard index
TST better way to test the normalize option
ENH add zero one loss based on jaccard distance + TST systematic test of normalize
DOC write narrative doc for jaccard and subset based metrics
Fix some doctest bugs
ENH make a new metrics jaccard_similarity_score instead of adding functionality to accuracy_score
Update the documentation for the jaccard_similarity_score